The thinner has a very important impact on the coating of the conformal coating of the circuit board, which is to make the conformal coating play a better role, but not all diluents are suitable for all kinds of conformal coatings. The premise of the application is to require performance matching, and today we will introduce to you the importance of matching the conformal coating of the circuit board with the thinner.
First, the appearance.
When the conformal coating of the circuit board is coated on the PCBA board, I think we will encounter the unsightly appearance of the paint film, such as cracks, bubbles, reduced transparency, etc., and the occurrence of these situations is related to the failure of the mismatch between the conformal coating and the thinner, the selected diluent evaporates too quickly, and the surface of the paint film is prone to defects such as cracks, bubbles and pinholes, which will directly affect the appearance and reduce the reliability and protective performance of the conformal coating.
Second, the flow rate.
Different diluents are different in terms of movement angle, viscosity, fluidity, etc., in solubility, compatibility, etc., the degree of solubility of conformal paint, and the degree of compatibility with conformal paint, etc., so the spraying parameters of products with different thinners and glues are different, and after spraying, the leveling, permeability and surface tension on the board surface will also be different, and the result will be different in a variety of uses.
3. Pollution.
In terms of pollution, taking into account the cleaning process of the equipment, the role of transparency has been mentioned before, in fact, the reaction between the thinner and the conformal coating is caused by the use of non-special thinner, because for the user, whether the diluent contains the chemical group that reacts with the conformal coating is not clear, usually the diluent is divided into inactive diluent and reactive diluent, if the diluent containing active groups is used, the equipment pipeline will be polluted by chemical reaction, so when cleaning the equipment, a special supporting diluent is selected.
Thinner with conformal coating is very common in the industry, and it is precisely because of the intervention of thinner that the process performance of conformal coating is greatly improved and the coating is convenient. Through the content shared above, we are more clear about the diluent used in conformal coating, emphasizing matching and special thinners. If you want to learn more about Xi diluents of different materials such as silicones, polyurethanes, rubber and acrylic, please leave a message in the comment section.